What's in heaven realm?
Oda is the only who can decided whether Elbaf is an "Egghead-lenght" arc or a mega arc like Wano or Dressrosa. But anyways, my point is, if Elbaf's gonna be a mid-sized or short arc, does the heaven realm still fit? I personally think yes, but not in a fleshed out way. Maybe it will be mentioned and have some lore with it.
Or if Elbaf is a mega arc, heaven realm chapters are inevitable.
But what's really in it? I don't know if this like a crazy statement but I subjectively think the heaven realm is more of like a symbolic thing and no one is living in there (as far as I know). I think it would just be a ceremonial place that the giants revered as sacred. There could be structure or statues there about the sun god or other gods.
But what are your personal takes on what inside the heaven realm and will we ever see it?